Issue 22, 2012

Planar tetra-coordinate carbon resulting in enhanced third-order nonlinear optical response of metal-terminated graphene nanoribbons

Abstract

Metal-terminated graphene nanoribbons (M-GNRs) with planar tetra-coordinate carbons (PtC) are investigated theoretically for a third-order nonlinear optical (NLO) response by using the sum-over-states (SOS) method. The third order NLO polarizability, two-photon absorption (TPA) and nonlinear reflectivity are investigated within the third-harmonic generation (THG) or degenerate four-wave mixing (DFWM) processes. The origins of third order NLO polarizability and TPA are analyzed in terms of the charge transfer process, which indicates that tetra-coordinate carbons in M-GNRs have an important role in the third-order NLO response. The dynamic nonlinear reflectivity of the M-GNR presents a resonant characteristic due to the large third order NLO polarizability. Moreover, the third order NLO polarizability and TPA cross section values increase as the ribbon size increases in the low frequency region of incident light, which indicates that their NLO properties can be tailored by controlling the ribbon size. This paper aims to shed light on the design of NLO properties and understanding of the NLO response mechanisms of graphene related materials.

Graphical abstract: Planar tetra-coordinate carbon resulting in enhanced third-order nonlinear optical response of metal-terminated graphene nanoribbons

Supplementary files

Additions and corrections

Article information

Article type
Paper
Submitted
14 Mar 2012
Accepted
02 Apr 2012
First published
03 Apr 2012

J. Mater. Chem., 2012,22, 11303-11309

Planar tetra-coordinate carbon resulting in enhanced third-order nonlinear optical response of metal-terminated graphene nanoribbons

G. Chai, C. Lin and W. Cheng, J. Mater. Chem., 2012, 22, 11303 DOI: 10.1039/C2JM31593A

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